Physics
Draw a graph of potential energy vs height for a body thrown vertically upwards. [Assume no friction is present.]
Related Questions
A nucleus of an atom consists of 146 neutrons and 95 protons. It decays after emitting an alpha particle. How many protons and neutrons are left in the nucleus after an alpha emission?
- protons = 93, neutrons = 142
- protons = 95, neutrons = 144
- protons = 93, neutrons = 144
- protons = 95, neutrons = 142
Complete the following by choosing the correct answers from the bracket :
(a) A …………… [class I/class II/Class III] lever will always have M.A. > 1.
(b) In a block and tackle system, increase in the weight of the movable block …………… [decreases/does not affect/increases] the efficiency of the pulley system.
(c) If the mass as well as the velocity of a body is doubled then the kinetic energy of the body …………… [is doubled/becomes eight times/becomes four times] the initial kinetic energy.
(d) Unit of power used in mechanical engineering is …………… . [watt/horse power/erg per second]
(e) Two copper wires can have the different …………… [resistivity/resistance] but will have same …………… .[resistance/resistivity]
(a) Name the waves used for echo depth sounding.
(b) Give one reason for their use in the above purpose.
(a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?
(b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.